package apiday03;
import java.util.ArrayList;
import java.util.Collection;
//  Collection 集合的演示
public class CollectionDemo {
    public static void main(String[] args) {
        Collection c = new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));
        System.out.println(c);

        Point p = new Point(1,2);
        boolean cantains = c.contains(p);
        System.out.println("是否包含："+cantains); // true

        c.remove(p); // 可以删除 只能删除一次
        System.out.println(c);

        // 集合中存放的事元素的引用
        Collection cc = new ArrayList();
        Point pp = new Point(1,2);
        cc.add(pp);
        System.out.println("pp:"+pp);
        System.out.println("cc:"+cc);

        pp.setX(100);
        System.out.println("pp:"+pp);
        System.out.println("cc:"+cc);

        /*
        Collection c = new ArrayList();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        System.out.println(c); // 返回格式 [........]

        System.out.println("size:"+c.size()); // size:5

        System.out.println("是否是空集："+c.isEmpty()); // false

        c.clear();; // 清空集合
        System.out.println("集合已清空");
        System.out.println(c);
        System.out.println("size:"+c.size()); // 0
        System.out.println("是否是空集："+c.isEmpty()); // ture
         */
    }
}
